Scenario
In some cases, we cannot complete all the task in the 4 hour that scrum specify by a 2-week sprint. This may be caused by a bad previous refinery, uncertain work or just big changes reveal ...

How much time should a developer spend on investigating bugs/user stories for sizing in a sprint?
Currently we have 2 sizing sessions and a developer has time (time-boxed at 5min) to investigate and ...

I am currently working for a company that has adopted scrum and we are trying to figure a rule for how to account for tech support, bug fixing and the unknowns of the Apple appstore within our sprints....